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COMP Cams CL12-600-8 Thumpr Hydraulic Roller Cam and Lifter Kit - 227/241

(GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91 + 242 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

CL12-600-8
6 reviews
Sale Price

$1,210.95

In Stock (6)

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Product Details

The COMP Cams Thumpr CL12-600-8 is a complete hydraulic roller camshaft and lifter kit engineered specifically for Chevrolet small block engines. This aggressive performance cam delivers the distinctive "Thumpr" lope and sound that enthusiasts crave, with excellent low-end torque and strong mid-range power.

Camshaft Specifications:

  • Advertised Duration: 279°/297° intake/exhaust
  • Duration @ .050": 227°/241° intake/exhaust
  • Valve Lift: .525"/.540" intake/exhaust (with 1.5 rocker ratio)
  • Lobe Separation Angle: 112°
  • Hydraulic roller design for reduced friction and increased durability
  • Recommended RPM Range: 1,800-5,600 RPM

Complete Kit Includes:

  • Hydraulic roller camshaft
  • 16 hydraulic roller lifters
  • Assembly lube for proper break-in
  • Installation instructions
  • COMP Cams decals

This camshaft profile is designed for street performance applications and works well with stock or mildly modified engines. The aggressive exhaust duration creates the signature Thumpr idle while maintaining good drivability and vacuum for power brakes. Best results are achieved with aftermarket headers, a performance intake manifold, and a 2,200-2,800 RPM stall converter in automatic transmission applications.

Requires compatible hydraulic roller lifter components in the engine block. Not compatible with flat tappet lifter bores without modification. Professional installation recommended.

Products specifications

Fits

GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91, C3500 1979-86, 1988-95, K2500 Suburban 1979-86, 1992-95, K3500 1979-86, 1988-95 + 239 more models

Advertised Exhaust Duration

303

Basic Operating RPM Range

1,900-5,600

Kit Type

Cl-Kit - Cam and Lifter Kit

Exhaust Valve Lift

0.497

Intake Valve Lift

0.511

Exhaust Duration at .050 inch Lift

241

Camshaft Material

Austempered Ductile Iron

SK-Kit Upgrade

GK12-600-8

K-Kit Upgrade

K12-600-8

AMAZON ASIN

B001GENSZI

Usage

Street/Performance

Assembly Lubricant Included

No

Valve Springs Required

Yes

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for On-Road Vehicles?

No

C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?

Yes, but must be a race/competition only vehicle.

C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

Gaskets Included

No

Camshaft Gear Attachment

3-Bolt

Locks Included

No

Lifter Type

Hydraulic Roller

Intake Duration at .050 Inch Lift

227

Cam Type

Hydraulic Roller

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

No

LOBE SEPARATION

107

Advertised Intake Duration

283

Engine Family

Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)

Valve Stem Seals Included

No

Camshaft Series

Thumpr

They have easy forms and fair prices

Ordered a sling to store my roof rack. There was an issue with the supplier which was quickly resolved by the Autoplicity staff. Great customer service -- most responsive I've ever seen.<br><br>Best prices around.

Super easy to browse web site and find the product I wanted.<br>The price was unmatched.<br>Shipping was fast and cheap.<br>Super shopping experience.

Great prices, helpful customer service. Ordered 2 by mistake. And they got it cleared up real fast. Saved over $80 off retail. Will be ordering from the, again!!!!! <br>

Rather amazing and uneventful service in this day and age. Ordered a Thule bike rack for my Nissan Murano. It was in stock (unusual for high-end specialty products), shipped the next day, and was on my doorstep in a few days (excellent for a 60 lb. large box). I'd buy anything from these people without any reservation. AND, your order is insured - completely superfluous. Oh, and did I mention, the lowest price I could find ANYWHERE, and not by a few dollars - a lot.

Excellent service with the actual stock on hand, shipment was made the next day and a tracking number was provided. I have tried 2 other online supply stores which don't know what they have in stock.

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